Global positioning system receiver
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United States of America Patent
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Jun 26, 1984
Grant Date -
N/A
app pub date -
Nov 16, 1981
filing date -
Nov 16, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the 'front end' of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor for processing via an interface circuit which includes a relatively simple amplitude detector and a novel biphase detector. The microprocessor also controls the phase shifting of a pseudorandom noise code generator whose output is modulated with the output of the first intermediate frequency stage of the receiver.
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